When I thought of a little shell, I could think only of Marcel. This is a simple 2 piece top in garter and stockinette, with a little bit of feminine shaping and little side slits. The shoulders are joined with a 3 needle bind off and the sides are seamed.

NEEDLES AND STITCHING:
US 5 straight or circular needles, or size needed to achieve gauge 22 stitches and 30 rows = 4 inches in stockinette